Steam generator



Nov. 23, 1937. w. R. IRWIN STEAM GENERATOR Filed Oct. 29, 1954 3 Sheets-Sheet l INVENTOR. William 12055 $101};

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ATTORNEY.

Nov. 23, 1937. w. R. IRWIN STEAM GENERATOR Filed Oct. 29, 1934 3 Sheets-Sheet 3 IN VEN TOf? [0111mm E055 firm):

ATTORNEY Patented Nov. 23, 1937 PATENT OFFICE STEAM GENERATOR William Ross Irwin, Springfield, 111., assignor to Springfield Boiler Company, Springfield, 111., a.

corporation of Illinois Application October 29, 1934, Serial No. 750,415

5 Claims.

This invention relates to tubulous boilers and furnaces therefor and is particularly directed to boilers of large size and generating capacity.

The principal object of the invention is to provide an improved steam generator which will be particularly simple in construction and durable and eflicient in operation.

Other objects of the invention are to provide a boiler having a novel form of slag screen and water wall; to provide a boiler of this type in which some of the tubes of the lower bank are bent out of their normal position to provide greater clearance between the lower tubes and also to provide a water wall for the furnace; to provide a water wall for one of the walls of the furnace which is formed of tubes connected with the header of the main bank; to provide improved cooling means for the lower portion of the furnace or walls adjacent to the stoker; and to provide such other novel features of construction and such advantages in use as will be described more fully hereinafter.

In the accompanying drawings illustrating this invention,

Figure 1 is a vertical longitudinal section taken on the line l-| of Figure 4 and showing a modified form of construction;

Figure 2 is a perspective detail of the lower end of one of the headers showing the pipes connected therewith;

Figure 3 is a cross section taken on the line 3-3 of Figure 1;

Figure 4 is a cross section taken on the line 4-4 of Figure 1; and

Figure 5 is a sectional plan view taken on the line 55 of Figure 1.

In these drawings some of the parts are shown diagrammatically and other parts and attachments common to such apparatus are omitted for convenience in illustration, it being the intention however to provide suflicient information so that one skilled in the art may produce a complete op erative steam generator embodying my improved or novel features.

In the form of the invention shown in Figures 1 to 5, the boiler has a front header 32, rear header 33 and main bank of tubes 34. The header 32 is connected by circulating tubes 35 with the drum 36 which is connected by supply tubes 37 with the rear header 33.

In the present instance the furnace 38 is shown as being of the type or shape commonly used with chain grate stokers such as indicated at 39. The front of the furnace is provided with a water wall 40. This wall is formed by bending down each alternate tube in the lower row of the main bank of tubes.

These tubes are preferably bent adjacent to the front header 32 and are so formed as to provide the type of wall and front arch as may be required for the particular type of stoker. The lower portions 41 of these tubes are bent outwardly and connected with a header 42. This water wall may be backed up by a Wall 43 formed of any material suitable for this purpose. The lateral spacing of the portions of the tubes 4| forming the front arch is such that T-tile as shown in Figure 3 may be inserted between the tubes and will be supported solely thereby. Such tile forms an ignition arch which is essential or desirable for the front portion of the furnace.

The alternate lower tubes 44 of the lower bank extend across the top of the furnace and are bent downwardly at the rear of the furnace to form a rear water wall 45. The lower ends 46 of these tubes are bent outwardly and are connected with the header 41. This rear water wall may also be backed up with a wall 48 of any suitable material which is arranged to seal with the lower end of the baffle 49. The portions of the rear arch tubes are also spaced as indicated for supporting T-tile in the same way as the front arch, such tile thus providing the necessary rear arch.

The tubes of the main bank may be arranged in any desired manner but as indicated particularly in Figure 2, are arranged in groups of four. The tubes which would ordinarily appear immediately above the tubes are omitted, thus providing an additional space between the tubes of the second row in the second lowermost row of the bank of tubes. This provides a slag screen of two tubes height as will readily be seen from Figures 2 and 4. This screen arrangement taken in connection with the front and rear water walls for the furnace will be sufficient for operation of boilers of this type at moderately high ratings.

The header 33 is connected by nipples 50 with a header 5| which in turn is connected by means of pipe 52 with the headers 41.

In order to prevent overheating and burning out of the refractory side walls 53 of the furnace along the top of the chain grate stoker 39, I provide cooling pipes commonly known as a clinker chill for each side of the furnace. The pipes 54 and 55 at the respective sides of the furnace are arranged immediately above the ledge plates 56 of the stoker. The pipes 54 are connected at the front with a short vertical header 5'! and at the rear with a similar header 58. The header 5'! is connected by means of a pipe The pipes 55 are connected at the front with a short vertical header 6i and at the rear with a similar header 62. The header 6| is connected with the header 42 by means of a pipe 63 and the header 62 is connected with the header 5| by means of a pipe 64.

When the generator is in operation, water from the drum 36 passes down through tubes 31 to the header 33 and a portion thereof returns to,

the drum through the main bank of tubes 34 in the usual manner. A portion of the water passes downwardly through pipes 52 to'the header 41 and thence through the tubes of the rear water wall 45 to the header 32. Another portion of the water passes downwardly through the end tubes 60 and 64 to the rear headers 58 and 62 and then through the clinker chill pipes 54 and 55 to the headersr5'l and 6] and then through pipes 59 and 63' to the header 42', thus supplying this header with water for the front water wall 49 through which the water passes up to the head- On account of connecting the clinkerchill or side wall cooling tubes with the front wall 40, positive circulation through the horizontally positioned clinker chill is assured due to its series connection with vertical tubes positioned within the furnace, thus more effectively protecting the sides of the furnace; While I have shown two tubes oneither side of the furnace for the clinker chill it :will of course be evident that any desired number of these tubes may be utilized for this purpose. I r

It will be understood that the generator is provided with the necessary supports for the boiler and'cther features commonly utilized in making a complete operative apparatus but which form no part of the present invention and therefore description of the same does not appear necessary. While my improvements have been illus- .trated in connection with boilers of the sectional headertype it will also be noted that it is also applicable many other type such as boilers with boxheaders and either of the cross or long drum yp V It will also be noted that my invention may be subject to various changes or modifications-in order to adapt the same to such different types or forms of boilers and therefore I do not wish to be limited to the particular apparatus herein shown and described except as set forth in the following claims, in which I claim:

1. In a steam generator, the combination of aboiler having inclined tubes, upper and lower headers for said tubes, a combustion chamber below the tubes, a stoker for supplying fuel to the combustion chamber, a water wall formed of tubes connected with. an upper header and extending downwardly along the front of the furnace, a header connected with said tubes, horizontal tubes positioned on' either side of the 'stoker along the adjacent portion's'of the walls,

headers for said tubes, pipes connecting the rear headersfof the tubes with the lower header of the boiler, and pipes connecting the frontheadersrof the tubes with the header connected with the water wall tubes. 7

2. In a steam generator, the combination of a boiler having horizontally inclined tubes, front 7 and rear headers connected with said tubes, a

drum, pipes connecting the headers with the drum, a furnace below the tubes, a chain grate stoker for supplying fuel to the furnace, a water wall for one of the walls of the furnace comprising tubes connected with one of said headers, a header connected with the opposite end of the tubes of the water wall, one or more tubes extending longitudinally of the furnace at either side thereof adjacent to the upper surface of the stoker, pipes connecting the rear ends of said last named tubes with the rear header of the boiler, and pipes connecting the front ends of said tubes with the header of the water wall whereby said last named tubes are in flow series with the tubes of the water wall. I

3. A steam generator including a boiler hav ing a main bank of horizontally inclined tubes, upper and lower headers connected with said tubes, a combustion chamber below the tubes, a series of tubes connected with the lower portion chamber, a conduit connecting the lower ends of V the tubes of the. last named series, pipes connecting said conduit with the lower header of the boiler, clinker chill tubes positioned on either side -of the lower portion of the combustion chamber, rear headers for the respective tubes on either side of the chambenpipes connecting said headers with the lower header of the boiler, headers for the front ends of the clinker chill tubes, and pipes connecting the last namedheaders with the conduit of the first named series of tubes.

4. In a steam generator, the combination of a boiler having inclined tubes connectedwith front and rear headers, alternate tubes of the lowermost row connected with the front header being extended downwardly and forming a front water wall and water cooled arch for the furnace, and other alternate tubes of the lowermost row extending backwardly in normal position along the main bank and then downwardly forming a rear a boiler having front and rear headers with inclined tubes connecting the same, alternate tubes of the lowermost row connected with the front header extending downwardly and then forwardly to form a front water wall and water cooled arch, and other alternate tubes of the lowermost row extending backwardly in substantiallynormal position along the main bank and then downwardly and rearwardly to form a rear water wall and a rear water cooled arch,.means for supplying water from the boiler to said water walls, and refractory materialsupportedby said arch portions to form ignition arches. v

WILLIAM ROSS IRWIN. 

